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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a7976e7646ee448e10205b873a30bd9f30ec1bdaf908d092c6b8a07f11e5c8a' 
  AND token = 'e2qvybUj8MSby+MtM05Byb8ZxkskyDjobZ1ikG1JvuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}